See also Find it in the Open: Tips and tricks for searching open access articles (SFU Library)
There are many repositories which include preprints (articles not yet peer-reviewed) and postprints (articles that have been peer-reviewed but don't have the "official" layout of the publisher). Below is a selection by subject.
What is it?
Chrome and Firefox browser extension that helps you find legal open access article PDFs.
How does it work?
Once you have installed the browser extension, whenever you search an article, a lock icon will appear. A green "unlock" means an open access version is available somewhere else. Click on the green icon and it will bring you to the article.
If it's a grey lock, it means Unpaywall couldn't find a free version.
What is it?
Website an/or browser extension that lets you search for an open version of an article.
How does it work?
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